session.hpp

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/*
 * This file is part of libkazv.
 * SPDX-FileCopyrightText: 2021 Tusooa Zhu <tusooa@kazv.moe>
 * SPDX-License-Identifier: AGPL-3.0-or-later
 */
 
#pragma once
#include <libkazv-config.hpp>
 
#include <memory>
#include <tuple>
 
#include <maybe.hpp>
 
#include "crypto-util.hpp"
 
namespace Kazv
{
    class Crypto;
 
    struct InboundSessionTag {};
    struct OutboundSessionTag {};
 
    struct SessionPrivate;
    struct CryptoPrivate;
    class Session
    {
        static std::size_t constructOutboundRandomSize();
 
        explicit Session(OutboundSessionTag,
                         RandomTag,
                         RandomData data,
                         CryptoPrivate &cryptoD,
                         std::string theirIdentityKey,
                         std::string theirOneTimeKey);
 
        // Creates an inbound session
        explicit Session(InboundSessionTag,
                         CryptoPrivate &cryptoD,
                         std::string theirIdentityKey,
                         std::string message);
 
    public:
        explicit Session();
 
        Session(const Session &that);
        Session(Session &&that);
        Session &operator=(const Session &that);
        Session &operator=(Session &&that);
        ~Session();
 
        bool matches(std::string message) const;
 
        bool valid() const;
 
        MaybeString decrypt(int type, std::string message);
 
        std::size_t encryptRandomSize() const;
 
        std::pair<int /* type */, std::string /* message */> encryptWithRandom(
            RandomData random, std::string plainText);
 
    private:
        friend class Crypto;
        friend struct CryptoPrivate;
        friend struct SessionPrivate;
 
        friend void to_json(nlohmann::json &j, const Session &s);
        friend void from_json(const nlohmann::json &j, Session &s);
        std::unique_ptr<SessionPrivate> m_d;
    };
}